tiny-compiler/src/virtual_machine.h at master · nandesu/tiny-compiler · GitHub

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#ifndef VIRTUAL_MACHINE_H
#define VIRTUAL_MACHINE_H

#include <stdio.h>

#include "stack.h"
#include "symbol_table.h"
#include "codes.h"
#include "generator.h"

#define POP_BOTH arg2 = pop(); arg1 = pop()
byte *cur_byte = obj;

byte next_byte()
{
    return *cur_byte++;
}

void run()
{
    int arg1;
    int arg2;
    int i;

    next_op:
    switch (next_byte()) {
        case PUSH: push(next_byte()); goto next_op;
        case READ: push(get_sym(next_byte())->val); goto next_op;
        case WRITE: set_sym(next_byte(), pop()); goto next_op;
        case ADD: POP_BOTH; push(arg1 + arg2); goto next_op;
        case SUB: POP_BOTH; push(arg1 - arg2); goto next_op;
        case MUL: POP_BOTH; push(arg1 * arg2); goto next_op;
        case DIV: POP_BOTH; push(arg1 / arg2); goto next_op;
        case RET:
            for (i = 0; i < table_size; i++) {
                printf("%s = %i\n", get_sym(i)->name, get_sym(i)->val);
            }

            return;
    }
}

#endif